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Instructor: 00:00 The goal of this course is to provide a good overview about the syntax, and even more importantly, the semantics of the programming language Reason. Each lesson is focusing on a specific feature, concept, or best practice, and can be watched independently.

00:14 Still, the whole course is carefully crafted to get someone from zero knowledge about Reason to a state where they're ready to use it. In case you're even undecided if you should explore Reason, let me share my top three reasons why I care about it.

00:27 The language is statically typed, which provides more safety and clarity, while evolving a code base. Instead of writing all the types all the time, a large portion of it can be inferred by the compiler.

00:39 To me, this is the best of both worlds. For once, you can move fast, but you don't lose any of the benefits and guarantees that come with static types.

00:48 My second reason is that let bindings, as well as most of the built-in data structures, are mutable by default. In the last couple years, I started to appreciate immutable data structures more and more, as they helped the teams I was working with to avoid bugs.

01:03 Nevertheless, if declared explicitly, Reason offers escape hatches for mutability. To me, again, the best of both worlds.

01:11 My third, and to me, probably the most exciting reason is the usefulness of variants in combination with pattern matching. Variants allow us to express multiple options that are exclusive as a data structure.

01:28 Pattern matching allows us to do exhaustive checking on these results. With both of them in combination, we can make states that should never happen impossible to exist.

01:39 Of course, neither of these magically eliminate bugs. Properly used, though, they can be of great assistance when programming. I hope this course is helpful to you, and I'm looking forward to hear what you build with Reason.